A new book argues the US is being torn apart by radical wings inside both major parties, not by one side or the other — bad news for anyone hoping the next election fixes things.

• Open borders are described as fuel on the fire of America's internal conflict.
• A forthcoming book, *Our Own Worst Enemies*, rejects the idea that either Harris or Trump alone could have solved the country's problems.
• The US is framed as having at least four parties, not two, with two radical wings driving the dysfunction.
• Those radical wings take turns in power and keep pushing the country further apart.

Outlook: Expect continued polarization regardless of which side wins next, with the book's release likely to add to the debate over America's political fracture.